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Fertilization

Fertilization

During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...

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Related Experiment Video

Updated: Dec 15, 2025

Two Types of Assays for Detecting Frog Sperm Chemoattraction

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Published on: December 27, 2011

Sperm-Particle Interactions and Their Prospects for Charge Mapping.

Veronika Magdanz¹, Johannes Gebauer¹, Priyanka Sharan²

¹Applied Zoology, Faculty of Biology, Technische Universität Dresden, Zellescher Weg 20b, 01062, Dresden, Germany.

Advanced Biosystems

|July 11, 2020

Summary

This study reveals non-uniform charge distribution on bovine sperm membranes, with positive charges concentrated on sperm heads. This method tracks dynamic charge changes during sperm maturation.

Keywords:

cryo-scanning electron microscopy nanoparticles sperm cells surface charge zetasizer

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Related Experiment Videos

Last Updated: Dec 15, 2025

Two Types of Assays for Detecting Frog Sperm Chemoattraction

Two Types of Assays for Detecting Frog Sperm Chemoattraction

Published on: December 27, 2011

Fluorimetric Techniques for the Assessment of Sperm Membranes

Fluorimetric Techniques for the Assessment of Sperm Membranes

Published on: November 28, 2018

Recording Electrical Currents across the Plasma Membrane of Mammalian Sperm Cells

Recording Electrical Currents across the Plasma Membrane of Mammalian Sperm Cells

Published on: February 14, 2021

Area of Science:

Reproductive Biology
Biophysics
Surface Science

Background:

Sperm membrane charge is crucial for fertilization.
Understanding sperm charge distribution is key to reproductive health.
Previous methods lacked precision in mapping sperm surface charge.

Purpose of the Study:

To develop and demonstrate a novel method for investigating sperm charge distribution.
To analyze the electrostatic interactions between sperm and charged particles.
To examine dynamic charge changes during sperm maturation.

Main Methods:

Fabrication of differentially charged particles.
Investigating particle attachment distribution on bovine sperm membranes.
Utilizing bright field microscopy, cryo-scanning electron microscopy, and energy-dispersive X-ray analysis.

Main Results:

Sperm membrane charge distribution is non-uniform.
Bovine sperm cells exhibit an overall negative net charge.
Positively charged regions are predominantly located on sperm heads.
Dynamic charge distribution changes were observed upon heparin-induced maturation.

Conclusions:

The electrostatic sperm-particle interaction method effectively maps sperm surface charge.
Sperm head regions possess distinct positive charges.
Heparin-induced maturation significantly alters sperm membrane charge dynamics.